In case Customs duties are short--levied or not levied on import or export, the Customs may, within ______ after the date of payment of Customs duties or the date of relesse of the goods, recover the amount of Customs duties short-levied or not levied.

A．six months

B．one year

C．two years

D．four years

凡是离合器，都具有安全保险作用。